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Mesa Dual Rectifier PSU Film cap

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  • Mesa Dual Rectifier PSU Film cap

    Hi, can anyone explain the purpose of that .047uF film cap at the input of the choke?
    Click image for larger version

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    Is it a bypass for noise from the diodes?
    Or is some kind of resonant filter?
    If it is a critical value, how does one go about calculating?
    Thank you!

  • #2
    I think it's to minimize popping when the standby switch is closed.
    "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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    • #3
      Could be it is to stop the voltage across the switch from going too high when it is opened.

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      • #4
        Thanks guys. No head scratching either way

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